Friday was an exceptionally busy day inside Cincinnati’s Lindner Family Tennis Center, because Thursday’s partly rained-out session meant there were more than the usual quarterfinal matches to play.

Several players were on double duty on Friday, having to play both their third-round and quarterfinal matches only hours apart. One player who mastered this feat was none other than the reigning world No.1 Karolina Pliskova, who first had to play Camila Giorgi and then Caroline Wozniacki.

Interestingly enough, the hard-hitting Italian proved to be more of a challenge than the former world No.1, as Giorgi managed to take a set off of Pliskova, while Wozniacki went down in two quick sets with Pliskova making her way into the semifinals. The Czech will next meet Garbine Muguruza, who had the comfort of having to play only one match on Friday, beating Svetlana Kuznetsova in an epic three-set tussle.

The second semifinal will see Simona Halep and Sloane Stephens. Halep managed to get by Johanna Konta in straight sets, while Sloane Stephens won her two matches of the day, first beating Ekaterina Makarova and then Julia Goerges, who was also on double-duty on Friday.